Sympathetic detonation

Properties of explosives

Published in Lopez Jimeno Carlos, Lopez Jimeno Emilio, Javier Ayala Carcedo Francisco, Ramiro Yvonne Visser de, Drilling and Blasting of Rocks, 2017

Lopez Jimeno Carlos, Lopez Jimeno Emilio, Javier Ayala Carcedo Francisco, Ramiro Yvonne Visser de

In the majority of the industrial explosives, the maximum distances at which sympathetic detonation is produced are between 2 and 8 times their diameter, depending upon the type of explosive. The measures of the Autostimulation Coefficient can be taken either directly or indirectly; however, in the second, only 50% of the energy given by the direct method is transmitted.

Geotechnical analysis of blasting sequence and resulting shapes of drawbells in block cave mines

View Article

Journal Information

Published in Mining Technology, 2023

Nadia Bustos, Ernesto Villaescusa, Italo Onederra

Near-field vibration or acceleration monitoring has been used for many years to evaluate the detonation efficiency of multiple detonating charges in a wide range of blasting scenarios. As a diagnostic tool, it provides a clear picture of the contribution of individual charges to the breakage and fragmentation process, as well as identifying potential irregularities such as charge dislocations; sympathetic detonation and/or excessive confinement. In drawbell construction, monitoring is an important element of the continuous improvement of design and implementation practices. Figure 14 shows the results of a blast monitoring record collected during drawbell construction. The data shows a higher level of vibration towards the end of the detonation sequence. That is, when the holes near the boundary of the drawbell detonate. However, as described earlier, those holes fail to break the rock into the initial void.

Sympathetic detonation

Explore chapters and articles related to this topic

Properties of explosives

Geotechnical analysis of blasting sequence and resulting shapes of drawbells in block cave mines